Abstract
The pitting potential of binary Al Cu, Al Zn, and Al Mg alloys, with a alloying content from 0 to 5%, were studied in 1.0 M NaCl solutions. The pitting potential of the alloy was found to increase as much as 200 mV by alloying aluminium with copper. The alloying of aluminium with magnesium had small effect on the pitting potential of the alloy. The alloying of aluminium with zinc, on the other hand, produced a decrease of as much as 200 mV in the pitting potential. As predicted by the transport mechanism for pitting, the alloying elements were found to modify the pitting potential by changing the anodic behaviour of the alloy in the pit-like solution. The maintenance of a localized acidification on the metal-solution interface was found to be the main cause for pitting.
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